Perl::MinimumVersion takes Perl source code and calculates the minimum
version of perl required to be able to run it. Because it is based on
PPI, it can do this without having to actually load the code.
WWW: http://search.cpan.org/dist/Perl-MinimumVersion/

Make it so that the default Perl is always called perl5.
- Move Perl's man1 files along with its man3 files.
- Move where Perl installs its modules man1 pages.
- Convert the ports installing man1 pages.
- Make different Perl versions installable at the same time.
Though you should note that only the default version can be used to
install Perl modules, and the non default Perl versions cannot use the
modules installed via ports if they contain .so as they are installed
in a version specific directory.
Reviewed by: bapt (the Mk bits)
Exp-run by: antoine
Sponsored by: Absolight
Differential Revision: https://reviews.freebsd.org/D3542

Change the way Perl modules are installed, update the default Perl to 5.18.
Before, we had:
site_perl : lib/perl5/site_perl/5.18
site_perl/perl_arch : lib/perl5/site_perl/5.18/mach
perl_man3 : lib/perl5/5.18/man/man3
Now we have:
site_perl : lib/perl5/site_perl
site_arch : lib/perl5/site_perl/mach/5.18
perl_man3 : lib/perl5/site_perl/man/man3
Modules without any .so will be installed at the same place regardless of the